# Solving the equation for an IN/OUT table

• September 28th 2009, 02:24 PM
Sarah-
Solving the equation for an IN/OUT table
This is the In/Out table I've been given:

In|Out
3|8
5|12
9|20
15|32
X|?

Should the bottom of the In/Out table be 2(X + 1) OR 2X + 2? Or are both equations correct? Or are neither correct? This is a problem I'm not sure about. 2X + 2 seems to work but I'm not sure about the other one. Thanks for your advice.
• September 28th 2009, 02:41 PM
pickslides
Quote:

Originally Posted by Sarah-

Should the bottom of the In/Out table be 2(X + 1) OR 2X + 2? Or are both equations correct?

both are correct because they are the same equation

$2(X + 1)$

$2\times X +2\times 1$

$2X +2$